Birthday Cake Contest Flavors And Ideas, Help Please!

It's gonna be first contest ever... the rules are very open, it has to be a Bday cake and choose flavors and fillings and we have to make 2. 1 for the lights and other for tasting.I'm not sure if I should go for adult or kids themes!! But I'm more towards to kids, 'cause it's very fun.I can't decide the flavors, should I go for the classics (like buttercreams: strawberry, chocolate, raspberry, apple, jams, curds, etc) or should I try something different (but delicious of course) like mango or passion fruit or pineapple fillings, mousses etc) I'll be judge by popular vote so I don't want to make something really weird like pistachio cake with mojito filling lol (just an example lol). I don't want to scare people's palate, but the country I'm from, people are used to more tropical fillings and very sweet fillings, or curds (buttercream is almost never used), I don't know if different fillings would be well accepted, even though I'm sure they are delicious.They said I can use more than 1 cake flavor or fillings.Also, I don't know if I should make 2 identical cakes, or different ones. I don't really know which one is gonna be judged for the look. They said they expect people to duplicate the cakes. Weird.. lolI've checked the galleries and google for ideas of bday cakes and I want to make them all!!!!!!!!!!! lololPlease, some light at the end of the tunnel?

I'd go w/something slightly different both for cake and filling.As you said you don't wamt to be too 'far out' but different.Yeah, kid's cakes can be fore fun to design. However a humorous cake for a man also could have lots of merit and show skill.

Should I go for buttercream or fondant? I'm better working with fondant (and I love much more to work with it), but I know most of people love buttercream even though my fondant tastes like marshmallows